Thanks for these tips.
Those two registry keys are the same, mbagge.
Is it safe or approporiate to delete some or all of these keys and let MC reestablish the correct keys when I recheck shell integration in MC16?
Jim, this may sound weird but I don't use media server or auto import and I always disassociate all files from MC upon installation.
(Files open in other proprietary editing software when I double click them, so I don't want MC to have association since I use it as a player & database only and prefer to launch it manaully.)
Reboot regularly - Yes!
Even if MC16 is already running and MC12 not, Right click > Media Center > Import ---> launches MC12 and imports the files.
I have just noticed that there is only one machine in the house on which this is occurring - the one that I use to import and tag new files!
I also have a video rendition problem on only one machine - the one on which I watch my video files!